A few guys on the train were beating another guy. An elderly man decided to intervene. One of the bullies said to him: "Now, what you're gonna do old man, is say you're sorry for bothering us and you're gonna turn yourself around and go sit down if you know what's good for you. Otherwise I'm gonna have to kick your ass too".
I have a problem with that "is say". I'm not sure how to understand it.
Although I don't get that "is say", I think the sentence says: If you know what's good for you you should better say you're sorry for bothering us, turn around and go back and sit down.
The elder guy refused and the bully replied: OK, just so's my kicking your ass won't be over too fast, I'll only use one hand."
Does "so's" mean "so is"? I think these sentences are not written correctly as far as grammar is concerned.
Thanks
Top answer
It's perfectly idiomatic. "Say" is the bare infinitive. What you're going to do is this: etc.
— Avangi
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